The method and device for transmitting and receiving signals in a wireless communication system, according to one embodiment of the present invention, comprise: receiving downlink control information (DCI) for scheduling a single physical uplink shared channel (PUSCH) or a plurality of PUSCHs to be transmitted on a serving cell; and transmitting the single PUSCH or the plurality of PUSCHs on the serving cell on the basis of the DCI, wherein the payload size of the DCI may be determined on the basis of the larger one of the number of bits of the pieces of information for scheduling the single PUSCH and the number of bits of the pieces of information for scheduling the plurality of PUSCHs.